For a street strip cheap build it would be hard to beat a 360 magnum with a reground cam. And a .030 set of pistons with EQ heads. Those heads really move some air with a little work. 400 to 450 hp depending on what you budget for valvetrain upgrades. If i ever do another 5.9/360 it will retain the stock rockers and lift will max at about .520 but still ought to make 425 hp?

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky